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Section 5 Watchdog Timer (WDT)
Rev. 4.00 Sep. 14, 2005 Page 155 of 982
REJ09B0023-0400
Section 5 Watchdog Timer (WDT)
This LSI includes the watchdog timer (WDT), which enables reset the LSI on overflow of the
counter when the value of the counter has not been updated because of a system malfunction.
The WDT is a single channel timer that counts up the clock-settling period when the system leaves
standby mode or the temporary periods on standby that occur when the clock frequency is
changed. It can also be used as a watchdog timer or interval timer.
5.1 Features
The WDT has the following features:
•
Can be used to ensure the clock settling time: The WDT is used in leaving standby mode or the
temporary periods on standby that occur when the clock frequency is changed.
•
Can switch between watchdog timer mode and interval timer mode.
•
Generates internal resets in watchdog timer mode: Internal resets occur after counter overflow.
Power-on reset or manual reset can be selected as a reset.
•
Interrupt generation in interval timer mode
An interval timer interrupt is generated when the counter overflows.
•
Choice of eight counter input clocks
Eight clocks (
×
1 to
×
1/4096) that are obtained by dividing the peripheral clock can be selected.
Содержание HD6417641
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Страница 11: ...Rev 4 00 Sep 14 2005 Page xi of l USB Universal serial bus WDT Watch dog timer...
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Страница 204: ...Section 4 Clock Pulse Generator CPG Rev 4 00 Sep 14 2005 Page 154 of 982 REJ09B0023 0400...
Страница 212: ...Section 5 Watchdog Timer WDT Rev 4 00 Sep 14 2005 Page 162 of 982 REJ09B0023 0400...
Страница 228: ...Section 6 Power Down Modes Rev 4 00 Sep 14 2005 Page 178 of 982 REJ09B0023 0400...
Страница 246: ...Section 8 X Y Memory Rev 4 00 Sep 14 2005 Page 196 of 982 REJ09B0023 0400...
Страница 318: ...Section 11 User Break Controller UBC Rev 4 00 Sep 14 2005 Page 268 of 982 REJ09B0023 0400...
Страница 454: ...Section 12 Bus State Controller BSC Rev 4 00 Sep 14 2005 Page 404 of 982 REJ09B0023 0400...
Страница 500: ...Section 13 Direct Memory Access Controller DMAC Rev 4 00 Sep 14 2005 Page 450 of 982 REJ09B0023 0400...
Страница 504: ...Section 14 U Memory Rev 4 00 Sep 14 2005 Page 454 of 982 REJ09B0023 0400...
Страница 566: ...Section 17 Compare Match Timer CMT Rev 4 00 Sep 14 2005 Page 516 of 982 REJ09B0023 0400...
Страница 734: ...Section 18 Multi Function Timer Pulse Unit MTU Rev 4 00 Sep 14 2005 Page 684 of 982 REJ09B0023 0400...
Страница 868: ...Section 21 A D Converter Rev 4 00 Sep 14 2005 Page 818 of 982 REJ09B0023 0400...
Страница 914: ...Section 23 I O Ports Rev 4 00 Sep 14 2005 Page 864 of 982 REJ09B0023 0400...
Страница 956: ...Section 24 List of Registers Rev 4 00 Sep 14 2005 Page 906 of 982 REJ09B0023 0400...
Страница 1016: ...Section 25 Electrical Characteristics Rev 4 00 Sep 14 2005 Page 966 of 982 REJ09B0023 0400...
Страница 1024: ...Appendix Rev 4 00 Sep 14 2005 Page 974 of 982 REJ09B0023 0400...
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